refactor: migrar GitLab → Gitea (aulas 10, 11, 13)

- Aula 10: Gitea + Registry + Actions + Runner (substituiu GitLab)
  - gitea-values.yaml: PostgreSQL standalone, Valkey standalone, ~800Mi RAM
  - setup.sh/cleanup.sh: namespace gitea, Helm gitea-charts/gitea + actions
  - README.md: documentação completa com de→para (GitLab/Harbor/Tekton vs Gitea)

- Aula 11: ArgoCD (GitOps) — removido GitLab Runner (runner vive na aula-10)
  - setup.sh: só ArgoCD, integração SSH com Gitea
  - node-bugado/.gitea/workflows/ci.yml: pipeline convertida

- Aula 13: Container Factory — atualizado para Gitea
  - setup.sh/cleanup.sh: referências GitLab → Gitea
  - pipelines/postgresql/ci.yml: Gitea Actions workflow
  - README.md: conexão com act_runner explicada

- CLAUDE.md: tabela de aulas atualizada

aula-13/pipelines/postgresql/ci.yml

@@ -0,0 +1,157 @@
+# =============================================================================
+# Gitea Actions Workflow - PostgreSQL Container Factory
+# =============================================================================
+#
+# Build de imagem PostgreSQL customizada em formato eStargz.
+# Push para Gitea Container Registry com lazy pulling habilitado.
+#
+# Requisitos:
+#   - Gitea Actions Runner com Docker (aula-10)
+#   - Secret REGISTRY_TOKEN configurado no repo
+#
+# Uso:
+#   1. Criar org 'factory' no Gitea
+#   2. Criar repositório 'postgresql' na org
+#   3. Copiar Dockerfile, postgresql.conf e este ci.yml para .gitea/workflows/
+#   4. Push para main - pipeline roda automaticamente
+#
+# =============================================================================
+
+name: Build PostgreSQL
+
+on:
+  push:
+    branches: [main]
+    tags: ['*']
+
+env:
+  REGISTRY: gitea.kube.quest
+  IMAGE_NAME: factory/postgresql
+  POSTGRES_VERSION: "17"
+
+jobs:
+  # ===========================================================================
+  # BUILD - Construir imagem em formato eStargz
+  # ===========================================================================
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Registry
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login ${{ env.REGISTRY }} \
+            -u ${{ gitea.actor }} --password-stdin
+
+      - name: Build eStargz image
+        run: |
+          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-8)
+          echo "Building ${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }}-${SHORT_SHA} with eStargz compression"
+          docker buildx build \
+            --output type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }}-${SHORT_SHA},push=true,compression=estargz,force-compression=true,oci-mediatypes=true \
+            --label "org.opencontainers.image.revision=${{ github.sha }}" \
+            --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
+            --build-arg POSTGRES_VERSION=${{ env.POSTGRES_VERSION }} \
+            .
+
+  # ===========================================================================
+  # TEST - Testar imagem construída
+  # ===========================================================================
+  test:
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Login to Gitea Registry
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login ${{ env.REGISTRY }} \
+            -u ${{ gitea.actor }} --password-stdin
+
+      - name: Test PostgreSQL image
+        run: |
+          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-8)
+          echo "Testing PostgreSQL image..."
+
+          docker run -d --name pg-test \
+            -e POSTGRES_PASSWORD=testpassword \
+            -e POSTGRES_DB=testdb \
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }}-${SHORT_SHA}
+
+          # Aguardar inicialização (30s max)
+          for i in $(seq 1 30); do
+            if docker exec pg-test pg_isready -U postgres -d testdb 2>/dev/null; then
+              echo "PostgreSQL ready!"
+              break
+            fi
+            echo "Waiting for PostgreSQL... ($i/30)"
+            sleep 1
+          done
+
+          # Verificar healthcheck
+          docker exec pg-test pg_isready -U postgres -d testdb
+
+          # Testar conexão e queries básicas
+          docker exec pg-test psql -U postgres -d testdb -c "SELECT version();"
+          docker exec pg-test psql -U postgres -d testdb -c "SHOW shared_buffers;"
+          docker exec pg-test psql -U postgres -d testdb -c "SHOW max_connections;"
+
+          # Testar criação de tabela
+          docker exec pg-test psql -U postgres -d testdb -c "CREATE TABLE test (id serial PRIMARY KEY, name text);"
+          docker exec pg-test psql -U postgres -d testdb -c "INSERT INTO test (name) VALUES ('test');"
+          docker exec pg-test psql -U postgres -d testdb -c "SELECT * FROM test;"
+          docker exec pg-test psql -U postgres -d testdb -c "DROP TABLE test;"
+
+          # Cleanup
+          docker stop pg-test && docker rm pg-test
+          echo "All tests passed!"
+
+  # ===========================================================================
+  # PUSH - Tag como versão e latest
+  # ===========================================================================
+  push:
+    runs-on: ubuntu-latest
+    needs: test
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Registry
+        run: |
+          echo "${{ secrets.REGISTRY_TOKEN }}" | docker login ${{ env.REGISTRY }} \
+            -u ${{ gitea.actor }} --password-stdin
+
+      - name: Push version and latest tags (eStargz)
+        run: |
+          echo "Tagging and pushing final images..."
+
+          # Tag como versão (17)
+          docker buildx build \
+            --output type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }},push=true,compression=estargz,force-compression=true,oci-mediatypes=true \
+            --label "org.opencontainers.image.revision=${{ github.sha }}" \
+            --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
+            .
+
+          # Tag como latest
+          docker buildx build \
+            --output type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest,push=true,compression=estargz,force-compression=true,oci-mediatypes=true \
+            --label "org.opencontainers.image.revision=${{ github.sha }}" \
+            --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
+            .
+
+      - name: Push GZIP version (for benchmark)
+        run: |
+          docker buildx build \
+            --output type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }}-gzip,push=true,compression=gzip,oci-mediatypes=true \
+            --label "org.opencontainers.image.revision=${{ github.sha }}" \
+            --label "org.opencontainers.image.created=$(date -u +%Y-%m-%dT%H:%M:%SZ)" \
+            .
+
+          echo "Images pushed:"
+          echo "  - ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }} (eStargz)"
+          echo "  - ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.POSTGRES_VERSION }}-gzip (GZIP)"
+          echo "  - ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest (eStargz)"